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Probably made and used by Dick Richards, who lectured in Physics at the Ballarat School of Mines, and later became the principal. Earlier Dick Richards had been a member of Shackleton's Antarctic Exploration Expedition.
A 15cm diameter glass disc, 2.3 cm thick. ONe side is ground concave to 7'=5" (s s7 cm) radius. Rough-hewn circumference. Stored between a pair of 5cm thick 16 x 20 pieces of polystyrene slab, hollowed to accomodate mirror.
